Jack.



H. H. LAMPERT.

JACK.

APPLICATION FILED APB.16,'1913.

Patented May 19, 1914.

UNITED STATES PATENT OFFICE.

' VSpecification of Letters '.Patent. v Pgtefed hlay 19, 1914,k .lpplitln Ile'd April 16k, 1913. Serial No. 781,516.

Toall whom. it may concern.' i Be it known that I, Henny H. Laitrnnr, a `citizen of the United 'States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Jacks, of which the following is a specification.

This invention relates to improvements in tools, such as wrenches, jacks, etc., having the function of grasping one of two members operated upon and forcing it'relatively of the other member. y

The main objects of the invention are to provide ank improved tool particularly ada ted for grasping rods, bolts, stakes, etc.,

whi e obtaining apurchase on some member associated with said rod, etc., and forcing the same relatively of said member; to provide a tool of this nature, capable in a novel manner of gripping an objectl while applying a leverage between said object and another object associated therewith; to provide an improved lock for said tool whereby when it is operated to a certain entent it cannot return to its normal position; to provide in a tool of this class, improved adjustablm gripping members.

An illustratlve embodiment ofthis invention is shown in the accompanying draw` ings in which:

Figure 1 is a side elevation, lpartly inseetion and partly broken away, of a wrench or jack constructed according tokthis inven-` of which the walls are prevented from sepa-'- rating when the concrete is pouredtherein. In Fig. 1, one ,of said mold walls is' designated by the numeral 1, the rodu'passing through said wall by the numeral 2, and a clamp 3 is shown secured to the rod. `In this view the tool to which the present invention has direct relation is shown coperating with one of said rods andclamps for the purpose of forcngthe clamp against lthe mold` wall 1, previous to fastening the clamp to .rod 2, by means` of a set screw 4. The tool is thus shown 1n connection 'with lsaid rod and clamp as kit is particularly designed for tightening such clam s, but yit may be understood that the wrenc or jack is applicable to `many other uses.

In the drawings, the operating handle 5 of the wrench yis shown forked at its lower end to provide a pair of arms 6`and7, connected together byr a solid integral piece of metal 8, the latter having a recess 9 therein to which is pivoted,`by a pin 10,'a pair of arms or bell-crank levers 12. Pivoted to the `free end of the arms 12 is 'a gripping block 13, having a pivotal connection 14 with the arms 12, which is eccentrically lo-r cated'with respect to the toothed sides 15 of the block. Similarly eccentrically piv# oted by a pin 16 to arms 12, preferably'at kits elbow 17',v is a gripping block 18. The

their respective opposing gripping surfaces may be adjusted toward or away from each other for the purpose of'coperating with diiierent'sizes of rods. For the purpose of retaining either of t-he blocks in whatever position they have been adjusted to each of the blocks is provdedwith four holes 19,` for receiving a pin 20, which by coperating with pairs of shoulders 21 on the arms 12, prevent the blocksfrom turning on their pivots except for a certain limited'distance. Provision is made for such limitedl turning of the blocks inorder that they may adapt themselvestto the surfaces of the rod operated upon, irrespective of the rocking of le` ver 5 and a slight'rocking movement of the arms 12.

The lower ends of the yfork ortions' and 7 of the lever 5 are preferab y rounded as designated by the numeral 22, Fig.y 1, to betterl adapt the lever for coperating with su-chsurfaces as -presented by clamp k3. It

may be seen `that when the wrench is ap-y blocks 13 and 18 are both caused'to grip' the rod 2, while also ulling the rod to the right with respect to c amp 3.

In order that the clamp' 3 and rod 2 may be retained in the relative positions in which they are placed by the operation of thc wrench before the set screw 4 is tivlitened, and even after pressure is released from le-y ver 5, means are providedwhich Whilepermitting lever 5 to rock in the direction indricated by arrow 23, normally prevents the lever fromrrocking in the opposite direction. This means consists of a pawl 24 pivoted to arm 7 by a pin 25 and having a number of teeth 26 for coperating with a pin 27, car-r ried by one of the arms or bell-crank levers 12. A spring 28 normally urges the pawl .24 intoengagement with pin 27 while permitting the pawl to ratchet over the pin when lever 5 is rocked in the direction indicated by arrow 23. A spring 29 is preferably provided for normally urging the arms 12 to rock in such direction with respectv to lever 5, that in 27 is held into engagement with the teet on pawl 24, and thus does away with the free and loose connection which would otherwise exist between the arms 12 and the lever 5. The spring is shown wrapped around pivot pin 10 and bearing between the upper edgesof arms 12 and the upper surface ofthe recess 9 in the lever 5.

Inthe operation of the device, assuming that it is employed to ull outwardly on a rod such as rod 2, whi e bearing against a clamp 3, to force the saine inwardly relatively of the rod, the wrench is irstslipped over the end of the rod, the latter passing between the fork ends 6 and 7 of the lever 5 and between the vblocks 13 and 18; then when the rounded faces 22 are in contact with clamp 3, the lever 5 is swung to the right, Fig. 1, around pivot 10. This causes the rounded faces of the lever to bear against the clamp at each side of the rod and thereby have a tendency to force the pivot 10 rearwardly, and thus through the blocks 13 and 18, pulling the rod 2- to the right, while forcing these blocks toward each other, and thereby tightening their grip on the rod, as, because of the location of pivot 10, the bellcranks 12 are both forced rearwardlyfrom their upper ends and thereby have a tendency to turn in a clockwise direction around their pivotal connection 16 with block 18. Pressure at any time may bev relieved from lever 5 without fear of releasing the rod 2, as the pawl 4 by coperating with pin 27 will revent the lever 5 from rocking back toward its former position. Thus, when the operator has adjusted clamp 3 and rod 2 to the .desired position with respect to each other he may release the lever 5 and be free to tighten the set screw 4. v

It may be seen that the wrench may be adjusted to rods of different sizes simply by removing pins 20 and turning the gripping blocks to bring the desired surfaces into operative position. By this means the spaces between the blocks may be regulated,

the gripping surfaces 15 thereof are l0- eated at different distances from the centers of the pivotal connections between the blocks and the levers 12. After an adjustment of the blocks, by again inserting the pins 20 in the holes 19, which are between the slioulders 21, the blocks are revented from rocking out of said adjuste ositions. y f

Although but one specific embodiment o l this invention has been herein shown and described, it will be understood that numerous details yof the construction shown'may be altered oromitted without departing from the spirit of this invention, as defined by the following claims:

l. In a device of the class described, the combination of an operatingflever, an arm pivoted at one end to said lever, said arm being provided with gripping means at its opposite end, a second gripping means between said ends, and a connection between said lever and arm whereby they may be prevented from rocking relatively to each other in one direction. l

2. In a device of the class described, the combination of an operating lever, an arm pivoted at one end to said lever, said arm being provided with a pivoted gripping member at its opposite end, asecond pivoted gripping member between said ends, and means for normally preventing said arm and lever from rocking relatively to each -jother in one direction.

3..In a device of the class described, the combination of an operating-lever, an arm pivoted at one end to saidy lever, said arm `being provided with gripping means at its opposite end, and a second gripping means between said ends, one of said gripping means being of prismatic form and provided with a plurality of gripping surfaces and having an eccentric pivotal connection with said arm. A

4. In a device of the class described, the combination of an operating lever, an arm pivoted at one end to said lever, said arm carrying a pair of op osed gripping blocks, pivots connecting said) blocks with said arm, and each of'said blocks having a plurality of gripping surfaces-located at different distances from said pivots.

5. In a device of the class described, lthe combination` of an operatin lever, an arm pivoted at one end to saidlever, said arm being rovided with a pair of opposed gripping e einents, one of said elements having a plurality of gripping surfaces and being ad justable to make any of said surfaces operative, and means for maintaining a predetermined adjustment of said element.

6. In a device of the class described, the combination of an operating lever, an arm pivoted at one end to said lever, said arm being provided with a pair of opposed gripping elements, one of said elements being adjustable with respect to the other, means for maintaining a predetermined adjustment between said elements, and a device whereby relative rocking in one direction between said lever and arm may be prevented.

7. In a device of the class described, th` combination of an operating lever, a bellcrank pivoted to said lever, said bellorank being provided with a pair of opposed gripping elements, and a spring for normally urging said bellorank and lever to rock relatively to each other in one direction.

l Signed at Chicago this `14th day of April H. H. LAMPERT.

Witnesses:

RUDoW RUMMLER, M. IRENE HUTCHINGS. 

